Device for locating fallen drop wires



Nev. 17, 1931. J. G. AHLIN DEVICE FOR LOCATI NG FALLEN DROP WIRES Filed March 4, 1931 JNl/EN TOE JOHN G. A HL./N

Patented Nov. 17, 1931 A UNITED STATES PATENT OFFICE 7 JOHN G. .A.HLIN,. .OF'WORCESTEB, MASSACHUSETTS, .ASSIGNOR TO GBOMBTON & KNOWLES 1100M WORKS, OF WORCESTER, MASSACHUSETTS JL.COBPORATION OF MASSACHU- SETTS DEVICE Fen LOGAIING FALLEN n30? ZWIRES Application filed March 4,

This invention relates to warp stop mo tions used in looms for weavi-ng textile tabric... hen such-stop motions are used with warps having a large number of fine warp threads, it is frequently diliicu-lt to locate a fallen drop wire, as the wire is concealed by raised drop wires which crowd closely ainst it at both sides thereof.

It is the object of my invention to provide a simple device'by which a fallen drop wire maybe movedon its support to clearly indirate its position.

A more specific object of my invention is to irovide a coil spring extending longitudinally through openings'in a plurality oit' drop wires, together with'means for stretching the spring, whereby causing a fallen drop wire engaged byithe spring to be moved sideways suiiiciently to indicate its position.

My invention further relates to arrange- Fig. 3 is an end elevation. looking in the direction. of the arrow 3 in Fig. 1;

Fig. 4 is a detail sectional elcva'ion taken along the line 4t-l in Fig. 3. and Fig. 5 is a view s m lar to Fig. l but showing the parts in a different relation.

Referring to the drawings, I have shown a stop motion 01 a commercial type, adapted to be electrically operated. Supporting bars are mounted in end frame members 11 which are assembled on rods 14 having ofiset end portions 15 secured in brackets 16 mounted on the loom frame 20.

The supporting bars 10 are preferably formed of nner and outer contact plates 21 and 22 (F g. 4) adapted to be engaged by lugs 25 (Fig. 5) on the drop wires WV when a warp thread breaks and the wire drops. The wires W are provided with elongated slots q (Fig. l which extend substantially above the bar 10 when suspended on unbroken warp 193.1. Serial li'o. 520,068.

a common commercial form and is used 'for I purposes of illustration only, as my invention is applicable also to other similar stop motions.

For-the purpose of locating fallen drop wlres I place coil springs 4-0 in the spaces 32 and resting upon the upper edges of the supporting bars 10. A separate spring A0 is provided for eachbar 10 of the stop motion, but the ends of all of the springs 40 are preferably attached to handle members 42, each formed with down-turned ends 43 (Fig. 3) and with an outwardly projecting handle loop 144. The tension of the springs 40 normally holds these handle members 42 against the outer faces of the frame members 11 for the hars 10.

\Vhen all of the drop wires are raised to the position shown in Fig. 4, the springs 40 extend freely through the aligned spaces 32 in the drop wires. When a warp thread breaks, however, the associated drop wire falls to the position indicated in Fig. 5, making contact between theplates 21 and 22 and causing the loom 'to'be stopped. At the same time, that portion of the drop wire at the upper end of the slot 30 enters between two of the coils of the associated spring 40.

If the handle member 4.2 at one side or the other of the loom is then pulled outward.

the fallen drop wire caught between the spring coils will be moved along its supporting bar 10 sufiicient ly to separate it from the adjacent drop wires on one side thereof.

This resultis illustrated in Figs. '1 and 2. where the fa'llen drop wire W is shown separatedtfrom' the next adjacent raised drop wire Inth-is way a fallen drop wire in any one of the banks of drop wires may be quickly and easily located, so that the broken warp may 'bepieced up and the loom again placed in operation.

My improved indicating mechanism is extremely s mple in construction, inexpensive to manufacture and easily applied'to stop motions already built, without making any sit bstantial change in the construction there- Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims, but what I claim is 1. In a warp stop motion having a support ing bar and a plurality of slotted drop wires, an indicator for a fallen drop wire comprising a coiled spring extending along the upper edge of the drop wire supporting bar and extending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and means to stretch said spring beyond its normal condition to indicate the location of a fallen drop wire.

2. In a. warp stop motion having a supporting bar and a plurality of slotted drop wires, an indicator for a fallen drop wire comprising a coiled spring extending along the upper edge of the drop wire supporting bar and extending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and means to stretch said spring beyond its normal condition to indicate the location of a fallen drop wire, the coils of said spring when in normal position in said stop motion being spaced apart sufiiciently to admit an edge of a fallen drop wire between adjacent coils.

3. In a *arp stop motion having a supporting bar and a plurality of slotted drop wires, an indicator for a fallen drop wire comprising a coiled spring extending along the upper edge of the drop wire supporting bar and extending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and a handle member to which an end of said spring is attached and by which said spring may be stretched beyond its normal condition to indicate the location of a fallen drop wire.

4. In a warp stop motion having a supporting bar and a plurality of slotted drop wires, an indicator for a fallen drop wire comprising a coiled spring extending along the upper edge of the drop wire supporting bar and extending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and a handle member at each side of the loo-n1 to which the adjacent end of said spring is attached and by which said spring may be stretched beyond its normal condition to indicate the location of a fallen drop wire.

In a warp stop motion having a plurality of slotted drop wires arranged in parallel banks and a supporting bar for each bank, an indicator for a fallen drop wire comprising a plurality of coil springs corresponding in number to said banks and bars, with each of said springs extending along the upper edge of one of said supporting bars and. ex-

tending freely through the slots of the raised drop Wires but located in the path of a falling drop wire, and a single operating device effective to stretch all of said springs simultaneously beyond their normal condition to indicate the location of a fallen drop wire.

6. In a warp stop motion having a plurality of slotted drop wires arranged in parallel banks and a supporting bar for each bank, an indicator for a fallen drop wire comprising a plurality of coil springs corresponding in number to said banks and bars with each of said springs extending along the upper edge of one of said supporting bars and ex tending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and a handle member to which one end of each spring is attached and by means of which all of said springs may be stretched simultaneously beyond their normal condi' tion to indicate the location of a fallen drop wire.

7. In a warp stop motion having a plurality of slotted drop wires arranged in parallel banks and a supporting bar for each bank, an indicator for a fallen drop wire comprising a plurality of coil springs corresponding in number to said banks and bars with each of said springs extending along the upper edge of one of said supporting bars and extending freely through the slots of the raised drop wires but located in the path of a falling drop wire, and a pair of handle members, one at each end of said supporting bars and to which the adjacent ends of all of said springs are attached, each of said handle members constituting means by which all of said springs may be stretched from either side of the loom simultaneously beyond their normal condition to indicate the location of .1

fixed my signature.

JOHN G. AHLIN. 

